HI, thanks for your time, I'm trying to design a notch filter with a cutoff frequency of 60 hz. So I decided to use a single band pass filter 60 hz and then use an opamp to subtract the signal and thus have a notch filter, but the output instead of the desired output, I get the signal with gain 10 (wich its my gain on desing of single band pass filter) more the input signal. I hope your support and thank you very much for your time. sorry for my english im from mexico
red= first filter (single band pass filter 60 hz with 10 gain)
green= original signal
blue= output from substract
red= first filter (single band pass filter 60 hz with 10 gain)
green= original signal
blue= output from substract